| ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep extractvalue |
| |
| ; Instcombine should fold various combinations of insertvalue and extractvalue |
| ; together |
| declare void @bar({i32, i32} %a) |
| |
| define i32 @foo() { |
| ; Build a simple struct and pull values out again |
| %s1.1 = insertvalue {i32, i32} undef, i32 0, 0 |
| %s1 = insertvalue {i32, i32} %s1.1, i32 1, 1 |
| %v1 = extractvalue {i32, i32} %s1, 0 |
| %v2 = extractvalue {i32, i32} %s1, 1 |
| |
| ; Build a nested struct and pull a sub struct out of it |
| ; This requires instcombine to insert a few insertvalue instructions |
| %ns1.1 = insertvalue {i32, {i32, i32}} undef, i32 %v1, 0 |
| %ns1.2 = insertvalue {i32, {i32, i32}} %ns1.1, i32 %v1, 1, 0 |
| %ns1 = insertvalue {i32, {i32, i32}} %ns1.2, i32 %v2, 1, 1 |
| %s2 = extractvalue {i32, {i32, i32}} %ns1, 1 |
| %v3 = extractvalue {i32, {i32, i32}} %ns1, 1, 1 |
| call void @bar({i32, i32} %s2) |
| |
| ; Use nested extractvalues to get to a value |
| %s3 = extractvalue {i32, {i32, i32}} %ns1, 1 |
| %v4 = extractvalue {i32, i32} %s3, 1 |
| call void @bar({i32, i32} %s3) |
| |
| ; Use nested insertvalues to build a nested struct |
| %s4.1 = insertvalue {i32, i32} undef, i32 %v3, 0 |
| %s4 = insertvalue {i32, i32} %s4.1, i32 %v4, 1 |
| %ns2 = insertvalue {i32, {i32, i32}} undef, {i32, i32} %s4, 1 |
| |
| ; And now extract a single value from there |
| %v5 = extractvalue {i32, {i32, i32}} %ns2, 1, 1 |
| |
| ret i32 %v5 |
| } |
| |